This paper demonstrates the computational advantages of combining shell-like stress resultant elasto-plasticity with geometrically exact thin-walled beam finite elements. The material model employed follows the Ilyushin criterion for shell-type stress resultants, making it possible to bypass computationally expensive through-thickness numeric integration and enforce specific stress resultants to zero, leading to a particularly simple form of the return mapping algorithm and of the consistent constitutive tangent. This constitutive model is included in a geometrically exact two-node beam finite element which allows for torsion-related warping and Wagner effects. The accuracy of the proposed approach is assessed in several numerical examples.
- Geometrically exact beam theory
- Large displacements
- Stress resultant elastoplasticity
- Thin-walled members